My iPhone 4 Volume Key seems as if it is sticking?

My iPhone 4's volume up key seems like its sticking. It just randomly happened without reasoning, i've never even dropped the phone. I have no warranty left on it and the phone is only 4 months old. The volume down works fine. But with the volume up key, you have to push it hard to get it to actually turn up the volume, and its doesn't click either.

I have the iPhone 4 as well and I haven't had any problems with the volume key but have you tried maybe wiping it with a (have you ever saw the special wipes for glasses) glasses wipe, it isn't too wet and it won't damage your phone maybe giving it a little clean will loosen it up?

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